Design of granules for die pressing by organic compaction aids

Granules for die pressing determine the properties and reliability of ceramic parts and system components which are produced by a powdertechnological route. For the manufacturing of large-scale components, thus, the granules have to meet the following requirements: - Fine, preferably narrow size distribution of the granules - Homogeneous granule structure - Low to medium specific fracture load - High plastic deformation - Good flowability - High compressibility and low friction forces during pressing - Stable properties The adjustment of tailored granule properties requires a methodology as well as knowledge about technological and formulation-related influences such as, e.g., the effect of organic compaction aids. In the lecture a methodology will be presented, which allows the design of granules for die pressing by a target-oriented use of organic compaction aids. One aspect is the identification of the influence that different organic binders and lubricants have on the above-mentioned granule properties. The focus of the presented work is on the influence of binder-lubricant-mixtures on the strength distribution and the deformation behaviour of single granules as well as on the pressability of the bulk material.